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                     Secunia Research 28/10/2009

  - Mozilla Firefox Floating Point Memory Allocation Vulnerability -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

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1) Affected Software 

* Mozilla Firefox 3.0.14 and 3.5.3.

NOTE: Prior versions may also be affected.

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2) Severity 

Rating: Highly critical
Impact: System access
Where:  Remote

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3) Vendor's Description of Software 

"The award-winning Firefox Web browser has security, speed and new 
features that will change the way you use the Web. Don’t settle for 
anything less."

Product Link:
http://www.mozilla.com/firefox/

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in Mozilla Firefox, 
which can be exploited by malicious people to compromise a user's 
system.

The vulnerability is caused due to an array indexing error while 
allocating space for floating point numbers. This can be exploited to 
trigger a memory corruption when a specially crafted floating point 
number is processed.

Successful exploitation allows execution of arbitrary code.

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5) Solution

Update to version 3.0.15 or 3.5.4.

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6) Time Table 

14/09/2009 - Vendor notified.
14/09/2009 - Vendor response.
28/10/2009 - Public disclosure.

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7) Credits 

Discovered by Alin Rad Pop, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned 
CVE-2009-1563 for the vulnerability.

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9) About Secunia

Secunia offers vulnerability management solutions to corporate
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relevant to their specific system configuration:

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Secunia also provides a publicly accessible and comprehensive advisory
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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2009-35/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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